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Schedule II -Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 820    
Balance at End of Period 736 $ 820  
Reserve for Uncollectible Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 820 909 $ 751
Charged to Costs and Expenses 0 0 199
Deductions (44) (32) (56)
Other (40) (57) 15
Balance at End of Period 736 820 909
Reserve for Inventory Obsolescence [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 5,058 4,301 3,030
Charged to Costs and Expenses 1,562 3,204 1,985
Deductions (2,443) (1,978) (834)
Other (374) (469) 120
Balance at End of Period 3,803 5,058 4,301
Deferred Tax Valuation Allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 2,483 1,758 1,489
Charged to Costs and Expenses 817 725 642
Deductions 0 0 (373)
Other (41) 0 0
Balance at End of Period $ 3,259 $ 2,483 $ 1,758